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<title>Problem 1720. -- [Usaco2006 Jan]Corral the Cows -- 衡阳八中OJ离线版-2012-02-29</title><center><h2>1720: [Usaco2006 Jan]Corral the Cows</h2><span class=green>Time Limit: </span>5 Sec&nbsp;&nbsp;<span class=green>Memory Limit: </span>64 MB<br><span class=green>Submit: </span>39&nbsp;&nbsp;<span class=green>Solved: </span>19<br>[<a href='submitpage.php?id=1720'>Submit</a>][<a href='problemstatus.php?id=1720'>Status</a>][<a href='bbs.php?id=1720'>Discuss</a>]</center><h2>Description</h2><div class=content>
Farmer John wishes to build a corral for his cows. Being finicky
beasts, they demand that the corral be square and that the corral
contain at least C (1 <= C <= 500) clover fields for afternoon
treats. The corral's edges must be parallel to the X,Y axes. 

FJ's land contains a total of N (C <= N <= 500) clover fields, each
a block of size 1 x 1 and located at with its lower left corner at
integer X and Y coordinates each in the range 1..10,000. Sometimes
more than one clover field grows at the same location; such a field
would have its location appear twice (or more) in the input. A
corral surrounds a clover field if the field is entirely located
inside the corral's borders.

Help FJ by telling him the side length of the smallest square
containing C clover fields.
</div><h2>Input</h2><div class=content>* Line 1: Two space-separated integers: C and N

* Lines 2..N+1: Each line contains two space-separated integers that
        are the X,Y coordinates of a clover field.

</div><h2>Output</h2><div class=content>
* Line 1: A single line with a single integer that is length of one
        edge of the minimum size square that contains at least C
        clover fields.

</div><h2>Sample Input</h2>
			<div class=content><span class=sampledata><br />
3 4<br />
1 2<br />
2 1<br />
4 1<br />
5 2<br />
<br />
找一个区域至少包含3个草地,它会给出这些草地的坐标...<br />
注意是X_Y坐标系....<br />
<br />
INPUT DETAILS:<br />
<br />
|*   *<br />
| * *<br />
+------<br />
<br />
</span></div><h2>Sample Output</h2>
			<div class=content><span class=sampledata><br />
4<br />
<br />
OUTPUT DETAILS:<br />
<br />
Below is one 4x4 solution (C's show most of the corral's area); many<br />
others exist.<br />
<br />
|CCCC<br />
|CCCC<br />
|*CCC*<br />
|C*C*<br />
+------</span></div><h2>HINT</h2>
			<div class=content><p></p></div><h2>Source</h2>
			<div class=content><p><a href='problemset.html?search=Gold'>Gold</a></p></div><center>[<a href='submitpage.php?id=1720'>Submit</a>][<a href='problemstatus.php?id=1720'>Status</a>][<a href='bbs.php?id=1720'>Discuss</a>]</center>﻿<br>

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